MasTec is trading at $336.61, up 58.93%, after an unusually large after-hours move with no confirmed company-specific catalyst identified for September 24, 2026.

  • MasTec’s investor-relations page lists its latest release as the September 10 appointment of Ati Modak; its next earnings release is expected October 29.
  • Broader markets were lower, which does not adequately explain the sharp increase.
  • The move remains unconfirmed and may warrant rechecking for delayed news.